| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD 344-1990 | English | 1519 |
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[YD/T 344-1990] Requirements for PABXs access to public telephone switching network
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YD 344-1990
| Obsolete |
YD 344-1990
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